[240 2NR]

There's more to brakes than simply, if you can lock them you don't need anymore. The feel from the 300zx brakes is inspiring, drive some and then decide, I think you'll be convinced. Sure, the stock brakes are competant, but they still leave room for improvement. A sportier pad helps and once warm I find the KVR's pretty amazing though they still fall behind the Z brakes. I think the larger rotor and stronger caliper allow for greater modulation in addition to the heat capacity it adds (which may or may not get utilized). Either way there is room for improvement in the stock system, you may not need it, but the Z's are a very "affordable" and easy upgrade.